iATN Member GM Auto Repair Tech Exchange for March 24, 2008

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Open Help Requests for GM

	Help Request	Answers
	1995 Buick Roadmaster 5.7L Lighting hello all this buick was brought in with a overheat problem radiater was cracked it was replaced along with tstat when steeping on brake pedal heater a/c controls black out and radio blacks out when brake pedal is pressed and no fuel pump at times also there i...	View
	1990 Cadillac Eldorado 4.5L Poor Idle Quality, Surge, lack of power Vehicle came in for a rough idle and loss of power. Upon inspection vehicle has only 12 inches vaccum at idle and [...] at 2500 rpms, inspected for vaccum leaks none found inspected ign. timing good at 10 deg. btdc performed compression and cylinder leakage...	View
	2003 Cadillac DeVille 4.6L engine this car started burning oil about 6000 miles ago. at least that is when it was brought to our attention. the car is using at leat 1 qt per 1000 miles. once it used 3 qts in about 1500 miles. there is no signs of external leaks and the pcv system is clean with...	View
	1988 Chevrolet S10 Pickup 2.5L Hesitation Hi folks. I have this 1988 s-10 pickup w/manual tranny. Intermittent problem ,does not matter whether hot or cold where the vehicle has a hesitation problem. You depress accelerator pedal, but nothing happens. Vehicle will not die, but no power. Fuel pump & fi...	View
	1995 Chevrolet Blazer 4.3L extended crank/start customer states that vehicle has and extended crank after sitting for 3-4 days. we recently replaced the starter because the customer said he wore it out trying to start the vehicle. while it was here for the starter replacement we were unable to verify the ex...	View
	2001 Chevrolet Silverado 6.0L posible rear diff My question is has anything seen rear end diff clutch problems in the rear end to cause a moan and vibration when stopping? This is a new customer and i am having a chatter feel when taking off and the customer is complaining of a stopping moan and vibration n...	View
	2001 Chevrolet Monte Carlo 3.8L Lighting thanks in advance for any help concerning this problem i am getting a high beam out message in message center. and the high beams work correctly. all other lighting. aswell. i have no history on this vehicle. the only thing isee that could cause a possible pro...	View
	2002 GMC Sonoma 2.2L No Start This customer washed his engine, and then all his problems started. No faster than 5mph. He was told trans problem by trans shop. It will not run for me. Plugs were black and three double platinum plugs were missing the "nibs" on the center electrode. Will not...	View
	1998 Pontiac Grand Prix 3.8L abs hey guys. ive got a intermittant problem with code c0450. i have never seen this code before, and i can't find alot of info on it. car drives great other than the trac and abs light on. no noticable problem felt in the steering assist. i would appreciate any i...	View
	2000 Saturn LW2 3.0L MIL Lamp on came in for no ac---scanned--found 5.1 volts on ac pressure indicating ecm shut ac off for hi pressure problem. Check all three wires at pressure sensor and found 5 volts on black wire to ecm. Grounded wire--ac works. originally had 10 codes, mostly, I believe... Trouble codes: P1780 (trans ecm communication), P1283 (app sensor).	View

Fixes & Summaries for GM

	Fix/Summary	Answers
	1993 Chevrolet Lumina 3.1L No Start, Poor Idle Quality, Hesitation, Cuts out, Stall, Misfire I want to thank everyone for their time.It still is amazing to me so many want to help. This is a great tool for any shop. I had several problems with this vehicle. The main problem is all the oil leaks which the customer has elected to not repair. But the fin... Trouble codes: 82 (3X Signal Error).	24
	1994 Chevrolet Pickup 4.3L Poor Idle Quality, Hesitation, Stall, Misfire Hi all, Sorry for the late close on this one. We installed a reman distributor and the truck ran great. We shipped it and the customer drove it for a week without compliant. He then took it through a car wash and Wammo! We got the truck back and the O2 sensor...	14
	1995 Chevrolet Monte Carlo 3.4L timing belt Well, I'm going to have to consider this one fixed, at least for now. We installed all new components: Timing belt, tensioner pulley and idler pulleys, and a new tensioner and bracket. The belt appears to be riding towards the outside edge of the pulleys, ...	6
	1997 Chevrolet Monte Carlo 3.4L Poor Idle Quality, Surge, Cuts out, Stall well we finally got this car fixed. I would like to thank all that sent in help. Kevin from British Columbia,and also Bob from Florida hit it on the head it was the brake booster. I tried to hook this engine to another cars booster and the problem was still th...	12
	1997 Chevrolet Monte Carlo 3.1L radio Chris from Minn,you baled me out thank you,I owe you a beer or beverage of your choice.unlock code was 411 I remember doing this procedere but I have Mitchell on disc at home and no info whatsoever on that at all about theftlock radios?? couldn't even find the...	14
	1999 Chevrolet Suburban 5.7L Misfire hi thanks for all the very useful information i learned several new things. anyway my friend removed the plenum and checked over everything and said the injector plug o-ring was distorted. i received several tests to try and possible answers to this problem in...	19
	2000 Chevrolet Impala 3.8L lr wss AGAIN THANKS TO THOSE WHO REPLIED. BACKPROBED ABS MODULE CONNECNTOR CHECKING LR WSS,BATT,INGINTION, AND GROUND. FOUND INGINTION VOLTS DROPPING DOWN UNDER 5 VOLTS WITH CAR RUNNING. REPLACE THE INGINTION SWITCH.TOOK OLD ONE APART CONTACTS BURNT.	4
	2006 Chevrolet Impala 3.5L Hesitation, Surge I had four replies that seemed useful but nothing helped. The maf could only go one way and there was a clean paper filter installed, the battery and cables looked and tested like new, as suggested.This car has an in tank fuel filter. The car lot who is paying...	4
	2005 GMC Yukon 6.0L MIL Lamp on hey everyone thank you so much for the help you where all right, after removing the vent solenoid i was unable to blow threw it, unlike the new one which i could. The new one was only 25 bucks from GM. Since then i have done a pickup that cost 125 where i ha... Trouble codes: po446 (Evaporative Emission System Vent Control Circuit).	4
	1998 Pontiac Grand Prix 3.8L rear struts thanks guys. as almost all of you said sway bar links was the problem. could not find any play in them, but i disconnected both and drove car and noise is gone. replaced and all is well	15

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